High-order harmonic generation from a dielectric in the presence of a quasi-static field

Studies of laser-driven strong field processes subjected to a (quasi-)static field have

been mainly confined to theory. Here, we provide an experimental realization by

introducing a novel bichromatic approach for high harmonic generation (HHG) in a

dielectric that combines an intense mid-infrared (MIR) driving field with a weak terahertz

(THz) dressing field. Our work differs from previous two-color HHG studies due to the

disparate in MIR and THz field periods which is over a factor of 100 and the

ponderomotive potential of the THz field exceeds that of the MIR drive.